Ex-UFC Fighter Popped for DUI

3/4/2013 2:43 PM PST

Ex-UFC Fighter Ricco Rodriguez Arrested for DUI

Ex-UFC champ Ricco Rodriguez -- who also appeared on the first season of "Celebrity Rehab" -- has been arrested on suspicion of DUI, TMZ has learned.

According to law enforcement, Rodriguez was busted in L.A. yesterday morning at 1:25 AM. He was subsequently booked for misdemeanor DUI. Details surrounding the arrest are unclear.

He was released several hours later on $5,000 bail.

Ricco's rep tells TMZ, "When Ricco was arrested the police officer said he blew a .1. When they had him take another breathalyzer at the station only a few minutes later he blew a .08. We are wondering how a breathalyzer dropped .02 points after a very short time." Ricco's rep says they plan to fight the charges.

Law enforcement tells us, Ricco voluntarily took a breathalyzer test ... and it's not uncommon to get slightly varying results.